Method of synthesis of high dispersed spherical Y or Nb doped lithium titanate oxide using titanium tetrachloride and lithium hydroxide

Abstract

The present disclosure relates to a method of synthesis of Lithium Titanate Oxide used for a cathode of Lithium ion battery, the method comprising: (A) diluting TiCl4 with TiOCl2; (B) adding YCl3 or NbCl5 at the rate of 0.1˜2 mol % to Ti(mol); (C) forming a complex salt by dissolving to put at least one selected from a group consisting of Hydroxy propyl cellulose or Polyethylene glycol in a solvent, the Hydroxy propyl cellulose being a complexing agent and being a dispersing agent as well, whereas the Polyethylene glycol being a dispersing agent; (D) synthesizing a titanium precursor by adding an aqueous ammonia solution; (E) preparing Y or Nb doped titanium dioxide(TiO2) powder by heat-treating the synthetic product in a temperature of 500˜700° C.; and (F) mixing the Y or Nb doped TiO2 powder with LiOH.H2O and heat-treating the mixture in a temperature of 800˜900° C.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of Korean Patent Application No. 10-2012-0069829 filed on Jun. 28, 2012, which is herein incorporated by reference as if fully set forth herein.BACKGROUND OF THE INVENTION[0002]The present disclosure generally relates to synthesis of high dispersed spherical Y or Nb doped Lithium Titanate Oxide, and more particularly, to a technique of synthesis of nanoscale high dispersed spherical Y or Nb doped Li4Ti5O12, the technique comprising, in doping Y or Nb on TiCl4 to synthesize a titanium precursor, adding Hydroxy propyl cellulose and Polyethylene glycol together, the former being a complexing agent and being a dispersing agent as well, whereas the latter being a dispersing agent, to prepare Ti-precursor, and then adding the precursor and lithium hydroxide.[0003]In preparation for new next generation Lithium secondary battery such as storage devices for a Hybrid Electric Vehicle (HEV) or a Plug-in Hybrid / Elec...

AI Technical Summary

Benefits of technology

The patent describes a method for making high dispersed spherical Y or Nb doped Lithium Titanate Oxide, which can improve its electrochemical properties and lead to a high output when used in making a Lithium ion battery cathode. The method involves using a low-priced titanium tetrachloride (TiCl4) as a dopant, adding a complexing agent and a dispersing agent to prevent agglomeration, and resulting in high-dispersed complex salts. The method is cost-effective and effective in doping Y or Nb, without changing the particle size or tap density of the resulting Lithium Titanate Oxide. This results in an excellent material suitable for use in the fabrication of super capacitors or Lithium ion batteries.

Problems solved by technology

However, the Lithium Titanate Oxide exhibits a low electrical conductivity and fails to be charged or discharged at a high speed, and moreover it has a low power density per unit volume, and therefore many ways to overcome such problems have been studied.

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